19
2270 Fiber Optic Modem
Figure 2-2.
2201 Rack Chassis
Front View
with Modems
Installed
Table 2-A. Operating Mode Selections
Internal
DIP Switches
SCT Polarity
(C) Closed (O) Open
Jumper
4
5
6
Operating Mode
NORM
C
O
O
External Clock Mode (SCT suppressed)
NORM
O
C
X
Slave Clock Mode (SCT=Receive Clock)
X=DIP switch position 6 is dont care
INV
O
C
X
Slave Clock Mode (SCT=Receive Clock Inverted)
NORM
C
C
X
Slave Clock Mode (SCT returned on Ext Clk leads)
NORM
O
O
C
Internal Clock Mode Mode (SCT=Internal Clock)
INV
O
O
C
Internal Clock Mode Mode (SCT=Internal Clock Inverted)
DIP switch position 5 must be Open
NORM
C
O
C
Internal Clock Mode Mode (SCT returned on Ext Clk leads)